Two- and three-element line arrays
Two- and three-element line
arrays extend vertical
coverage-angle control to as
low as 125 Hz, for high intelli-
gibility in reverberant spaces
and reduced feedback poten-
tial below arrays.
better. They flanked the mid-bass
horn with dual, spaced LF
sources to form a three-element
line array, or “tripole.” They
found that by using the dual LF
sources alone at low frequencies
and by appropriately overlapping
the LF and MB sources in the
125- to 540-Hz frequency range,
a stable and restricted vertical
coverage angle could be main-
tained to as low as 125 Hz. (See
page 7 for more Merlin
®
details.)
The tripole effect is quite
dramatic in reverberant spaces.
A-B comparisons have been
made between high-quality
systems with similar frequency
response but directivity control
to only 2,500 Hz. When switch-
ing to the tripole, the listeners'
ears were drawn much more
strongly to the loudspeaker as
the source. The room seemed to
partly “disappear,” and both
vocal clarity and musical impact
were substantially increased.
The Xi-2153/64F may be crossed
over traditionally at 125 Hz and
1,760 Hz, with reduced vertical
directivity control below 800 Hz.
When the 48-inch height of
the Xi-2153/64F is excessive,
consider the 36-inch Xi1153/64F
(one 15-inch woofer) in dipole
configuration.
A DL-type 12-inch mid-bass
driver features RMD
™
and is
coupled to the 19-inch mid-bass
horn. Dual EVX-155 15-inch
woofers offer performance to
45 Hz, appropriate for numer-
ous systems without low-
frequency enhancement.
The DH6 large-format compres-
sion driver with RMD
™
provides
superior and level-stable upper-
frequency detail. It loads into a
rotatable 60° x 40° HF horn.
Providing more RMD
™
, the horn
is coaxially but asymmetrically
positioned within the mid-bass
horn to suppress unwanted
acoustic resonances and is fully
shrouded to preserve mid-bass
wave-front detail.
Xi-1183/64F and Xi-2183/64F:
Three-way, 18-inch 60° x 40°
full-range systems for con-
ventional crossover and
increased LF output
In situations where acoustic
conditions are sufficiently ideal
and/or the feedback potential
Xi-2153/64F: three-way,
dual-15-inch 60° x 40°
full-range system, tripole
configurable
Much of the mid and lower vocal
frequency range is often unwit-
tingly aimed primarily at highly
reflective room surfaces rather
than the absorptive audience.
This is because the horn mouths
or cones of loudspeakers are too
small to maintain or control the
rated coverage angle at these
frequencies. As a result, vocal
intelligibility and musical clarity
suffer. (The typical compact 60°
x 40° horn, about 12 inches
high, begins to expand beyond
its rated 40° vertical coverage
angle at about 2,000 Hz, well
above a major portion of the
vocal range.)
The mid-bass horn in the
Xi-2153/64F is large enough
(about 19 inches square) to
control its 60° x 40° coverage
to about 800 Hz, but Electro-
Voice engineers wished to do
Xi-1153/64F: three-way,
15-inch 60° x 40° full-range
system, dipole configurable
When extended-frequency verti-
cal directivity control is desired
but vertical clearance is limited,
the Xi-1153/64F could be the
answer. At 36 inches rather than
48 inches high, the Xi-1153/64F
has one EVX-155 15-inch woofer
adjacent to the MB horn. With
the Merlin
®
ISP-100 providing
MB/LF overlap in the 125- to
540-Hz range, vertical directivity
is controlled to 300 Hz.
The Xi-1153/64F may also be
conventionally crossed over at
125 Hz and 1,760 Hz, with
decreased directivity control
below 800 Hz.
below an array is nonexistent or
minimal, dipole and tripole
configurations are less necessary,
and the additional low-frequency
output of the EVX-180B 18-inch
woofer may be utilized. Typical
application examples include
well damped rooms and club
environments.
The EVX-180B extends low-
frequency response to 45 Hz,
and its additional cone area and
higher excursion ability more
than quadruples the low-
frequency acoustic output
(+6.3 dB).
The Xi-1183/64F features one
EVX-180B; the Xi-2183/64F
exployes two.
Xi-2123/106F: Three-way,
dual-12-inch 100° x 60°
full-range system, tripole
configurable
The Xi-2123/106F has a wide,
100° x 60° coverage pattern for
down-fill and distributed applica-
tions. The 60° vertical angle is
particularly appropriate when
mounting height is too low for
the more conventional 40° angle.
The Xi-2123/106F may be used
in tripole configuration with
Merlin
®
ISP-100 processing,
where overlap in the 250- to
550-Hz range of the MB horn
and the dual, flanking woofers
extends vertical pattern control
to 160 Hz. Such wide-band con-
trol of directivity increases voice
PAGE 4
“F” suffix indicates flying configuration.
Systems shown without grille.
Xi-1183/64F
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